Electrjc heater



B. B. KAHN. ELECTRIC HEATER.

APPLICATION FILED JUNE 2h 1920.

muerzzar: fle/"FmdBM/m l missued Apr. 12, 1921.

UNITED STATES PATENT OFFICE.

BEBTBAND B. MN, 01' CINCINNATI, OHIO, ASSICNOB TO THE'ESTATE STOVE COMPANY, OF HAMILTON, OHIO.

ELECTRIC HEATElBi.

Specification of Reissued Letters Iatent. Reissud Apr. 12, 1921.

ongmarm. 1,304,687, dated May 27, 1919, Serial No. 248,663, filed ,Tuly 25, 19 18. Application for rpillue filed June 21, 1920. Serial No. 890,845.

To all whom it may concern:

Be it known that I, BERTRAND B. KAHN, a citizen of the United States, residing at Cincinnati, Hamilton county, Ohio, have i11 vented certain new and useful Im rovements in Electric Heaters, of which t e following is a specification.

This invention, pertaining to electric heaters of the radiator reflector class, relates to the form and construction of the radiator and will be readily understood from the following description taken in connection with the accompan ing drawing, in which Figure 1 is a si e elevation, part vertical section, of a reflecting radiator embodying my invention, the section appearing in the 3, a hollow frusto-conical insulator se-' cured to the forward end of the stud, the open rear portion of the insulator being spaced forward from the reflector, this insulator being formed of refractory insulating material; 7

4, a groove extending helically around the exterior of the insulator;

5, a resistance wire, conveniently but not nece$arily coilai, this wire being laid in the ve and having its terminal ends projectmg throu h the wall of the insulator and rearwa to suitable binding-posts ada ed to have connected with them the con uctors for bringing current to the heater; and

6, ports leading to the interior of the insulator from the base of the helical groove therein.

Upon a passage of current throu h the ca wire it becomes heated an luminous and rays of heat are projected forwardly directly therefrom. At the same time rays from the wire strike the concave surface of the reflector and are reflected forwardly therefrom. Rays of heat from the wire are projected into the interior of the insulator thioughj he ports 6 and reach the .the front and the wire of the coilresistance wire and preventin portions of it fromrbecoming short-circuite he groove 15 less in depth than the diameter of the wire-coil, and the taper of the cone lssuch that one convolution of the wire-coil w ll appear as greater in diameter than the wire-coll immediateljl' in front of it. The result is that when t e cone is viewed from is luminous,- the appearance 1s that of a complete luminous rosette, except at the center of the cone.

le it is afact that I am not the first to construct a heating apparatus comprising a concave reflector in combination with a. luminous electric heating element disposed at the center, or approximate center, of the reflector, I do believe that it is new with me to employ in such a combination a luminous electric heating element conformed to provide a conical helix which is held in the reflector with the small end of the-'=' conical helix presented forwardly, so that when the heating element is viewed from the front,

each convolution thereof, except the first,

appears to be a ortion of greater diameter than the convo ution immediately to the front thereof, the result of this arrangement being that when the resistance element is heated to luminosity, the convolutio-ns of the heatin element are not individually distinguishab e, the heating element appearing to the eye as a single luminous and radiant rosette. This is an effect which, so far as I am aware,.has never before been obtained, and is directly attributable to the arrangement just described. .The herein described conformation and dis osition of the heating element whereby obtain the luminous rosette effect, and also the combination of this heating element with the form of heat ing element support herein shown and described, are considered by me to be salient and patentable features of my invention.

1. An electric heater comprising, a concave reflector, a frusto-conical insulator fixed at the center of the reflector and presenting its smaller end forwardly and provided on its periphery with a helical groove 110 I witha low separating land, and a helicalcoil" of resistance wire-coiled in such groove, the helical coil having a diameter greater than that of the groove in which it is seated, combined substantially as set forth.

2. A combination such as defined in claim 1, in combination with a supporting study pro ecting from the larger end of the insulator, substantially as set forth.

3. A combination such as defined in claim 1, when the insulator is hollow and its back open, substantially as set forth.

4. A combination such the groove, substantiall as set forth.

5. A combination such as defined in claim 2 when the rear end of the stud is anchored in the center of the reflector, substantially as set forth.

6. A combination-suchas defined in claim 5 .when the larger end of the insulator is spaced away from the reflector, substantlallyas set forth.

7. An electric heater of the class described comprising a concave reflector, a-heating element comprising resistance material having the form of a conical helix, said heating element being supported in the reflector with the central axis of the conical helix alined with the focal axis of the reflector, andthe small end of the convolution of the the first, being'disthe central axis of sented forwardly, each heating element, except posed a distance from the conical helix that is substantially greater than the'distance between said axis and the,

convolution immediately in front thereo'f, whereby the heating element, when heated to luminosity, presents the appearance of a single luminous rosette.

8. An electric heater comprising in combination with a concave reflector, a heating element carrier of insulating material and of substantially conical form supported, with its small end presented forwardly, at

' substantially the center of the reflector, a

radiant heatin element consistin of resistance material aving the form 0 a conical helix and fitted around said carrier, each of the convolutions of said heating element,- ex-. cept the first, being disposed a distance from the axis of the cone that is substantially greater than the distance between said axisand the convo ution immediately in front thereof, whereby the heating element when heated to luminosity presents the appearance of a single luminous rosette.

9. An electric heater comprising in combination witha concave reflector, a heating element carrier of msulating material and conical form supported, with its small end presented forwardly center of the reflector, a spiral groove formed in the outer tapering surface of said as defined'in claim 3, when the insulator is provided with ports, extending through its wall at the bottom of conical helix pre-- at substantially. the I carrier, together with resistance material turned around said carrier and fitting said oove, each of the convolutions of said eating element, except the first, being dis posed a distance from the axis of the cone that is substantially greater thanthe distance between said axis and the convolution immediately in front thereof, whereby the several convolutions of the resistance ma terial, when heated to luminosity, present the appearance of a single luminous rosette.

10. An electric heater comprising in combination with a concave reflector, a heating element carrier of insulating. material and of hollow conical form supported, with its small end presented forwardly, at substantially the center of the reflector, the rear or larger end of said conical carrier being open, a radiant heating element consisting of re-' sistance material havingtheform of a conical helix wrapped around said. carrier, so

that when viewed from the front, each backwardly against the reflector.

1'1. In anelectric the combination with a conical heatin ing material sposed at the "centerfbf said re ector with the smallerend of the carrier presented forwardly, a carried by said carrier, a stud projecting from the larger end of said carrier and anchored in the center of said reflector, said stud constituting the sole means for supporting the carrier and heating element from and in the reflector.

12. In an electric heater, the combination with a concave reflector, a heating element support of insulating material and conical form disposed in said reflector at substantially the center thereof with the smaller end of the carrier projecting-forwardly, resistance material wound around said support and carried thereby, said. conical'support being hollow and open at its-larger end, a stud having one end anchored in the heater,

smaller end of the support and extendin rearwardly through the open larger end 0 the sup ing anc thereof, said stud serving as the for supporting su port from and in the reflector.

n witnesswhereof, I hereunto subscribe my name this 14 day of June, 1920 BE TRAND B. KAHN.

ort, the other end of said stud be- Witnesses:

R. R. Assn, Dona Tm unm.

concave reflector, aig substantially. 7

element carrier ofyinsulatresistance element ored in the reflector at the center sole means 7 said heating element and its 

